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/*
* Copyright 2015 Anton Tananaev (anton@traccar.org)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.traccar.helper;
import java.util.ArrayList;
import java.util.regex.Pattern;
public class PatternBuilder {
private final ArrayList<String> fragments = new ArrayList<>();
public PatternBuilder optional() {
return optional(1);
}
public PatternBuilder optional(int count) {
fragments.add(fragments.size() - count, "(?:");
fragments.add(")?");
return this;
}
public PatternBuilder expression(String s) {
s = s.replaceAll("\\|$", "\\\\|"); // special case for delimiter
fragments.add(s);
return this;
}
public PatternBuilder text(String s) {
fragments.add(s.replaceAll("([\\\\\\.\\[\\{\\(\\)\\*\\+\\?\\^\\$\\|])", "\\\\$1"));
return this;
}
public PatternBuilder number(String s) {
s = s.replace("dddd", "d{4}").replace("ddd", "d{3}").replace("dd", "d{2}");
s = s.replace("xxxx", "x{4}").replace("xxx", "x{3}").replace("xx", "x{2}");
s = s.replace("d", "\\d").replace("x", "[0-9a-fA-F]").replaceAll("([\\.])", "\\\\$1");
s = s.replaceAll("\\|$", "\\\\|").replaceAll("^\\|", "\\\\|"); // special case for delimiter
fragments.add(s);
return this;
}
public PatternBuilder any() {
fragments.add(".*?");
return this;
}
public PatternBuilder binary(String s) {
fragments.add(s.replaceAll("(\\p{XDigit}{2})", "\\\\$1"));
return this;
}
public PatternBuilder or() {
fragments.add("|");
return this;
}
public PatternBuilder groupBegin() {
return expression("(?:");
}
public PatternBuilder groupEnd() {
return expression(")");
}
public PatternBuilder groupEnd(String s) {
return expression(")" + s);
}
public Pattern compile() {
return Pattern.compile(toString(), Pattern.DOTALL);
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
for (String fragment : fragments) {
builder.append(fragment);
}
return builder.toString();
}
}
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